Carbureter.



J. K. STEWART.

GARBURETEB.

APPLICATION FILED JULY 27, 1911.

Patented Dec. 3, 1912.

2 SHEETS-SHEET 1.

67 6 a 11W J6 J. K. STEWART.

GARBURETER. APPLICATION FILED JULY 27, 1911.

1,046,344, Patented Dec. 3, 1912.

2 SHEETS-SHEET 2.

JOHN K. STEWART, OF CHICAGO, ILLINOIS.

oaiaiaunn'rnn.

Specification of Letters latent.

Patented Dec. 3,1912.

Application filed July 27, 1911. Serial 640,749.

To all whom 'it may concern:

Be it known that I, JOHN K. STEWART, a citizen of the United States,residing at Chicago, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Carburetors, of which thefollowing is a specification, reference being had to the accompanyingdrawings, form:' ing a part thereof.

The purpose of this invention is to provide a carbureter, improved withrespect to the compactness of structure, simplicity in outline and easeof manufacture, over those heretofore commonly in use.

It consists in the elements and features of construction shown anddescribed in the drawings as indicated in the claims.

'In the drawings :Figure 1 is an axial section of a device embodyingthis invention, section being at the line 1-1, on Fig.

.2. Fig; 2 is a section-at the line -22, on

Fig. 1. Fig. 3 is a section at the line 3-3, on Fig. 1. Fig. 4: is a topplan view. Fig. 5 is a side elevation of the upper portion of theinterior element of the device.

The details of construction of the carbureter shown in the drawingsare'devised chiefly with a View to producing as simple and smooth an.outline and as compact a structure as possible with the minimum ofmembers protruding materially beyond-the main outlines of the casing andbody, and also adapted to have its parts assembled'and secured togetherin the easiest manner and with the most easily formed joints. Also theseveral parts are designed with special reference to producing them insteel dies so that they may be reproduced in finished form substantiallywithout machining. Toaccomplish these several ends, the structurecomprises an axially extending tubular member, 1, open at both ends andhaving nearer one end than the other a boss, 1, positioned obliquely tothe axis, and apertured obliquely to the axis of the said member, 1,

. for the purpose of seating, as hereinafter explained. an oil inletnozzle. The central member has exterior shoulders, 1 and 1, the outerdiameter of {the first being shown slightly less than the inner diameterof the second shoulder, said shoulders bot-h facing towardthe smallerend of the central member and. designed foinseating, respectively theoil cup or reservoir, 2, and a .partition plate, 3, which forms the capof said oil cup, said oil cup being centrally apertured at the bot-tomto fit the exterior of the said smaller end of the said central member,1, below the shoulder, 1 and having inwardly facing seat, 2*, around itssaid aperture to face said shoulder, 1, packing gasket, 4, be

ing interposed. The cap, 3, is centrally.

apertured to fit the cylindrical seat pro vided for it just below theshoulder, 1, and is stopped on said shoulder; and said cap is alsomarginally rabbeted on the under side at 3 to seat theupper end of thecup, 2.

The member, 1, protrudes below the cup and is exteriorly threaded for aclamping nut, 5, by which the cup .and its cap are both bound. tightlytogether andonto said central member, 1. The cup, 2, has at its lowerend an oblique boss, 2*, obliquely apertured and alined axially with theboss, 1*, but having its inner end spaced from the outer end of theboss, 1*. The oil inlet nozzle, 6, is inserted through the alinedapertures of the cup and central member, protruding into the axialchamber of the latter,- the boss, 2*, be ing interiorly threaded and thenozzle being exteriorly threaded at'its base for screwing into the cupwhile its upper extremity makes a practical drive fit in the axialaperture of the boss, 1*. The said nozzle has apertures, 6, at positionsin its length which will cause them to be exposed between the proximateends of the bosses, 1 and 2*, for admitting oil from the cup to thenozzle chamber. A needle valve, 7, having itsstem screwed into the baseof the nozzle, controls the discharge passage from the upper endthereof, which is positioned at a reduced throat-way, l in the axialchamber of the central member, 1. The cup, 2, has an integrally offsetsupply .valve chamber, 8, whose cavity, 8 is formed radially withrespect to the cup and 'communicates with the cavity of the latter.valve chamber has at its lower side an inlet passage, 8, extending outthrough a downwardly protruding and exteriorly threaded boss, 8,designed to afford attachment for the oil pipe, (not shown) throughwhich oil is supplied through the duct, 8 which is controlledby avertically positioned valve, 18, whose stem extends up into an axiallyapertured plug. 9, set-into the upper end of thevchamber, 8, in whichthere is provided a lifterv and guide, 10, for theupper end This of saidstem. The float, 11, in the cup, 2, hasa lever-arm, 12, fulcrumed in theneck or passage from the cup chamber to the supment to-the be served byply valve chamber, and forked for v engagementwith a spherical boss, 18on the valve stem, so that the rising and falling of the float trollingthe height to which the oil can rise in the cup, wit-h the purpose ofcausing the normal level to be at all times slightly below the terminalof the inlet nozzle, 6.

The central member, 1, has near itsupper end a horizontal flange, 1 andat its upper end at opposite sides it has lugs, 1 and 1 for receiving asimilarly formed coupling, 12, which is Suitably threaded for attachthecarbureter. Intermediate the shoulder 1 which stops the cap, 3, of thecup, and the flange, her, 1, has horizontally protruding bosses, 1 and 1in diametrically opposite. positi ons,'which are apertured in line witheach other for receiving with a drive fit a sleeve,

13*, to seat and guide a valve stem, 13 of an air inlet valve, 14, whoseseat and controlling spring are provided and accommodated as hereinafterexplained. A heating coil,

16, encompasses the central member, 1,

above the cup, 8, and below the flange, 1 The two ends of the pipeforming thiscoil, extend off at the top and bottom of the coil,

Itangentially with respect to the coil and parallel to each other.

which isthe lower end cap, 3, and positioned 4 axis of thecentral memberby a boss, 3, which projects up from out-leadingend at the top is snuglyseatedunder the boss, 1' and is similarly posi- The in-leadingend, islodged upon the tioned angularly about the axis by a downwardlyprojecting lug, 1

Both terminals of the coil end within a cylindrical shell, 19, whoselower end fits about the peripheral flange, (3 of the cap, 3, and whoseupper end'ihas an annularin-turned flange, 19,, which is stopped uponthe exterior upper margin ,of. the flange, 1, thereby inclosing chamberof said an annular chamber in which the heating coil, 16, ispositioned,.as

the-central member. At one side thesh'ell,

19, has a circular aperture for receiving the seat, 20, for the valve,15, and at a diametrically opposite position it has a smaller aperturefor receiving a nipple, 21, whose pur-' will close and open the valvefor conpipe leading to the engine to 1, the central mem- "seen in Fig.5, to open way between the'secunder side of the flange,

angularly about the the said cap. Thecoil, 16, of suitable size to admita of the coil, and it described, aroundvalve,

shell, 19, are introduced after the shell is in position, the fitting,21, being first entered throughthe' aperture Which ultimatelyreceives-theovalve seat, passed in' around the heating coil and insertedoutwardly into the aperture provided for it, wherein it is" stopped bythe outwardly-facing shoulder with which it is provided seating on theinner margin of said aperture. Thevalve, 13, having its-stem properlysecured to it, is next inserted through the sleeve, 13, extend ing asdescribed, across-the central member, 1. The collar,-24, is then passedon to the stem to the shoulder mentioned. The spring follows it and theadjustingc'ap nut, 22, is then screwed into place against the end of thespring. The valve seat,20, may now be inserted in place and secured byscrews. To accommodate the sleeve, 13, for the valve stem, 13, theheating coil is distorted, as

0nd and third coils from the bottom for said sleeve and stem., Thiscauses or per mits the form of the upper coils to be as seen in Fig.5,-that is, depressed in a vertical plane transverse to that at whichsaid sleeve and stem stand; and this depression afi'ords opportunity forthe mounting in proper position of the stem, 28, of a butterfly. valve,29, proper bosses, 1, to afford bearings for such. stem being formed onthe l of the member, 1.- This butterfly valve is introduced into theupper end of the axial cavity of the member, 1, after all the otherparts described are in position and the valve stem is then insertedthrough the shell which is apertured :on 'one side for that purpose,

passed through the bearings, 1 and 1nter Inediatelythrough the lugsprovided for it on the valve, and secured in place bypin' hing the valveto it as shown.

The cylindrical shell, 19, beside the apertures described for receivingthe valve, 20, and thefitting, 21, has apertures, 19 and 19, oppositethe inlet andexit ends of the pipe connection for coupling onto the saidtwojends is also apertured at 19,

for the stem, 28, of the butterfly valve, but

these apertures are substantially closed by I the parts protrudingthrough them, as described, so that said shell constitutes an airchamber around the heating-coil, to which the admission of air iseontrolled substan= t ally by the valve, 14. The purpose of this it willbe understood, is to furnish a supplemental supply of air in addition toair which will be drawn throughthe lower end of the central with the oilwhich will be sucked in at the same time through the oil nozzleconstitutmember, 1, for mixing W mg the primarycharges. It is desirablethat r I this supplemental air supply entering. through the. valve, 14,and which is to be heated by the coil before mixing with the primary oiland air charge which is passing through the axial chamber of the member,

1, should be thoroughly broken up so as to be mixed as uniformly aspossible with said primary charge; and for this purpose,'the member, 1,is perforated as shown, with a multiplicity of small apertures, 1distributed over the portion of its surface encom passed by the coil, sothat the air drawn in through the coil is delivered in a multiplicityofsmall jets or streams into the primary charge. It will be understoodthat the cap nut, 22, will be adjusted to tension the spring, 23, so asto control the degree, of opening of the valve, 14, and thereby regulatethe quantity of air which willbe drawn in through said passage valve,14, by v the suction of the eng ne.

The lifter, 10, for the valve, 18, is adapted for its purpose of liftingthe valve at will by the structure of the valve stem, which for thatpurpose has a flange, 18, at its upper end which seats on a shoulder, 10on the inner wall of said lifter, which is bored axially-to form 'aguide for the stem,-and counter-bored from the upper end to form saidshoulder. the purpose of this construction is to enable the operatortomomentarily lift the valve and admit an exceptionalcharge of oil, as issometimes desirable in starting.

I claimF- 1. A carbureter comprising an'oil chamber; an air chamber;means for heating the air in the air chamber, and a conduit into whichthe oil and heated air are separately discharged from said chambersrespectively;

said chambers being positioned end to end, and the conduit being a stemwhich is hol- .low fromfend to end and which extends through bothchambers for securing them together and communicating with both of them.2. A carbureter comprising an air chamber and an oil chamber which areboth substantially cylindrical and positioned end to end; means forheating the air in the air chamber; a conduit into which the oil andheated air are separately discharged from said chambers respectively,said conduitbeing a tubular stem axially positioned with respect to thetwo chambers and open from end to end; a partition plate between said.chambers lodged upon the upper end of the oil chamber, said tubularstem having a shoulder which stops upon the upper side of said partitionplate for binding said plate upon the oil chamber,and havingits-lowerend protruding from t.he b,ottom of theoil chamber and exteriorlythreadedfor' receiving a nut forbinding the oil chamber up against theunder side of the partition plate.

3. A carbureter comprising an oil chamseparately from them respectively;

It will be understood that.

ber and an air chamber both of which are substantially cylindrical inform and which .are positioned end to end; a conduit which extendsthrough both said chambers, and into which oil and'heated air aredischarged a partition plate between said chambers stopped upon the topof the oil chamber, said conduit. having at one end a flange which formsthe top of the air chamber, and having two stop shoulders facing towardthe other end, one of said stop shoulders being relatively remote from,and the other relatively near to said other end, for stoppingrespectively upon the partition plate and upon the bottom of the oilchamber; a heating coil encompassing "said conduit within the airchamberand having its two-ends stopped on said partition plate and saidflange, respectively; the conduit being protruded below the oil chamberand exteriorly threaded for receiving a-nut to clamp the partitionplateand the oil chamber together and against their respective shoulders onthe conduit.

4.. A carbureter comprising anoil chamber and an air heating chamber,both substantially cylindrical in form and positioned end to end; atubular member open from end to end and constituting a conduit extendingthrough both said chambers; a partition plate between said chambersstopped upon the top of the oil chamber; and a flange which forms thetop. of the air heat-- ing chamber, and a heating coil encompassing saidconduit within the air heating chamber stopped between said partitionplate and flange, the exterior wall of said heating chamber being ashell which telescopes outside of the partition plate and which isflanged at the upper end to engage above the flange of the conduit, saidshell having apertures for the intake and. exit ends ofthe heating coil.

5. A carbureter comprising an oil chamber andv an air heating chamber,both substantially cylindrical in form and positioned end to end; atubular memberopen from end to end and constituting a conduit extendingthrough both said chambers; a partition plate between said chambersstopped upon the top of the partition plate; a flange which forms thetop of the air heating chamber, a heating coil encompassing said conduitwithin the air heating chamber stopped between said partition plate andflange, the exterior'wall of said heating chamber being a shell whichtelescopes outside of the partition plate and which is flanged at theupper end to engage above'the flange of the conduit, said shell havingaperturesfor the intake and exit ends of the heating coil, a valve seatmounted'on said shell at one side an adjusting nut mounted on the shell:at the opposite side; a sleeve extending through. the conduit .in axialalinement with the valve seat; a Valve seating'in said valve my hand atChicago,' Illinois, this 25th day seat having a stemwvhich is 1slidzlblyldnountof July 1911. v 7 ed in said sleeve and whicl protru es towardthe adjusting hut, and a spring I JOHN STEWART 5 stopped en'said stemand against the ad- Witnesses:

.justing nut. CHAS. S. BURTON, In testimonyvvxthereof I have hereuntoset LUCY I. S ONE.

Copies of this pa t'enc may be obtained for five centseach, by addresssing the Gazpxnissioner at Patents.

- "Washington, I). O."

